D.C. milliammeter
Date: circa 1929
Inventory Number: 2003-1-0039
Classification: Ammeter
Maker: Weston Electrical Instrument Corporation (founded 1888)
Owner: P. S. Bauer (fl. 1930 - 1960)
User: Harvard School of Public Health (founded 1913)
Cultural Region:
Place of Origin:
City of Use:
Dimensions:
10.5 × 19.7 × 18.6 cm (4 1/8 × 7 3/4 × 7 5/16 in.)
Accessories: lid of box can be removed; small paper tag loose inside box with assembly & inspection info; standardization certificate (1929) on inside of lid
Description:
A wooden case with brackets for a leather handle now missing. Inside it is completely occupied by a voltmeter consisting of a black metal panel with an arc-shaped window. Inside one sees a linear scale with a reflective band underneath. The scale goes from 0 to 200 (millivolts).
Below the metal panel are three electrical connectors with bakelite caps, the rightmost of which labeled + by a metal knob next to it.
On the inside of the case's lid is the instrument's standardization certificate.
Below the metal panel are three electrical connectors with bakelite caps, the rightmost of which labeled + by a metal knob next to it.
On the inside of the case's lid is the instrument's standardization certificate.
Signedoval metal plaque on face plate: WESTON / MODEL322 / No 3361 / WESTON ELECTRICAL INSTRUMENT CORP. / NEWARK,N.J., U.S.A.
on standardization certificate: WESTON D.C. MILLIAMMETER, MODEL 322 No. 3361
on standardization certificate: WESTON D.C. MILLIAMMETER, MODEL 322 No. 3361
Inscribedplastic label on lid edge: D.C. MILLIAM 0-200
around screw in center of plaque: ADJUST / FOR ZERO
label on front panel: P.S. BAUER
around screw in center of plaque: ADJUST / FOR ZERO
label on front panel: P.S. BAUER
FunctionA portable voltmeter for measuring electrical currents.
ProvenanceFrom John B. Little, Department of Cancer Cell Biology, Harvard School of Public Health, Boston, MA 02115.